Between order and chaos: contrasting syntax in the advertising song in the Dusky (Phylloscopus fuscatus) and Radde’s (Ph. sсhwarzi) Warblersстатья
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Аннотация:Abstract Dusky (Phylloscopus fuscatus) and Radde’s
(Ph. schwarzi) Warblers are small insectivorous avian
species occurring as regular inhabitants of the taiga in
central and eastern Siberia. Their singing is characterized
by a typically discontinuous performance, strict stereotypy
of all song types and immediate variety in the course of a
song. The songs of both species have a typical trill structure
and the repeated trill syllables are composed of up to
three notes. Individual repertoires of Dusky Warbler males
include 60–70 song types, but each male has just 3 or 4
‘‘favorite’’ song types which are produced more often than
all the others and in total make up to a third of all vocal
production. The rest of the vocalizations are represented by
rare song types. The sequence order of different song types
looks like a random process. Only a few transitions within
the songs of some males appear more often than might be
expected by chance. In contrast, vocalizations of the
Radde’s Warbler represent a strictly determined periodic
process. All song types are produced according to fixed
sequences which include up to 22 different types. Because
of prolonged pauses between the songs, the performance of
such sequences takes up to 160–190 s. The rigid order of
performance of the song types does not change even with
the longest pauses (up to 20–30 s). After a pause, the male
invariably executes that song type which is expected in its
given place. The adaptive value of large repertoires with
either fixed or random sequences of song types is discussed